Ours came in at over £20K!!! That mostly went on the venue and catering - and our venue was probably way grander than we were planning but we totally fell in love with it. That also involved cutting down on costs elsewhere as well (my own stuff was very cheap for example - wedding dress was under £500 - my shoes were £15 from M&S, jewellry £6 and hair band (no veil or tiara) £6 - both from BHS). Plus I had no official bridesmaids so no dresses, hair or make up costs there - although in the event, 3 friends ended up taking on the role pretty much, but bought their own dresses and did their own hair and make up.
That probably doesnt really help matters does it?
One idea though - if you want a nice honeymoon but cant afford much, a honeymoon gift list is a great idea - especially if, like most people these days - you are already living together and already have plates, towels, bed linen etc. Its a personal thing though - I thought it was great, but I know other people don't like them, and dont like the idea of basically giving people money, and you can see how much they give etc. I don't personally see how thats any different from a gift list at John Lewis or whatever, you know exactly how much everything is that way, but some people can get funny about it.